In a 2006 interview with Verbicide Magazine, band members were asked if a new remix album would be produced for Demon Days as there was for Gorillaz. They answered that it was a possibility and that might involve the Spacemonkeyz again. In the same interview, they were asked if there might also be another G Sides. Again, their answer was that it might be possible. In January 2007, websites began listing a March release date for a Phase 2 B-sides album. One of the websites, musictap.net, later pushed this back to 3 April. According to Gorillaz-Unofficial, the reaction of official parties behind Gorillaz is that the release date is just a rumour for now. On 29 August, musictap.net reported that the B-side album would be titled D-Sides and would be released on 20 November. On 18 September 2007, the official Gorillaz fansite confirmed the release of the album, as well as unveiling the album artwork and track listing. D-Sides was released on 19 November 2007 in the UK and on 20 November 2007 in the U.S.
"Rockit", "DARE" (DFA remix), "Feel Good Inc." (Stanton Warriors remix), "Kids with Guns" (Jamie T's Turns to Monsters mix), "Kids with Guns" (Hot Chip remix), "El Mañana" (Metronomy remix), "DARE" (Junior Sanchez remix), "Dirty Harry" (Schtung Chinese New Year remix), "Kids with Guns" (Quiet Village remix) were made available for promotion of Demon Days.
"The Swagga" is found on the limited edition Demon Days DVD.